<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
		<script>
			var x =1,y = z = 0;
			function add(n){
				return n = n+1;
			}
			y = add(x);
			function add(n){
				return n = n+3;
			}
			z = add(x);
			console.log(z);
		</script>
	</head>
	<body>
	</body>
</html>
